Refresh the screen if pollEvent() is called without updateScreen() being called for a long time.

svn-id: r42139

3 files changed, 29 insertions, 5 deletions

diff --git a/backends/platform/dc/dc.h b/backends/platform/dc/dc.h
index f86a2c6065..b67bbb51a1 100644
--- a/backends/platform/dc/dc.h
+++ b/backends/platform/dc/dc.h
@@ -194,7 +194,7 @@ class OSystem_Dreamcast : private DCHardware, public BaseBackend, public Filesys
   SoftKeyboard _softkbd;
 
   int _ms_cur_x, _ms_cur_y, _ms_cur_w, _ms_cur_h, _ms_old_x, _ms_old_y;
-  int _ms_hotspot_x, _ms_hotspot_y, _ms_visible, _devpoll;
+  int _ms_hotspot_x, _ms_hotspot_y, _ms_visible, _devpoll, _last_screen_refresh;
   int _current_shake_pos, _screen_w, _screen_h;
   int _overlay_x, _overlay_y;
   unsigned char *_ms_buf;
@@ -220,11 +220,15 @@ class OSystem_Dreamcast : private DCHardware, public BaseBackend, public Filesys
   uint initSound();
   void checkSound();
 
+  void updateScreenTextures(void);
+  void updateScreenPolygons(void);
+  void maybeRefreshScreen(void);
   void drawMouse(int xdraw, int ydraw, int w, int h,
 		 unsigned char *buf, bool visible);
 
   void setScaling();
 
+
   Common::SaveFileManager *createSavefileManager();
 };
 
diff --git a/backends/platform/dc/display.cpp b/backends/platform/dc/display.cpp
index ba8e1ba04f..d1e95c6a91 100644
--- a/backends/platform/dc/display.cpp
+++ b/backends/platform/dc/display.cpp
@@ -285,11 +285,8 @@ void OSystem_Dreamcast::setShakePos(int shake_pos)
   _current_shake_pos = shake_pos;
 }
 
-void OSystem_Dreamcast::updateScreen(void)
+void OSystem_Dreamcast::updateScreenTextures(void)
 {
-  struct polygon_list mypoly;
-  struct packed_colour_vertex_list myvertex;
-
   if (_screen_dirty) {
 
     _screen_buffer++;
@@ -328,6 +325,12 @@ void OSystem_Dreamcast::updateScreen(void)
 
     _overlay_dirty = false;
   }
+}
+
+void OSystem_Dreamcast::updateScreenPolygons(void)
+{
+  struct polygon_list mypoly;
+  struct packed_colour_vertex_list myvertex;
 
   // *((volatile unsigned int *)(void*)0xa05f8040) = 0x00ff00;
 
@@ -448,6 +451,21 @@ void OSystem_Dreamcast::updateScreen(void)
   ta_commit_frame();
 
   // *((volatile unsigned int *)(void*)0xa05f8040) = 0x0;
+
+  _last_screen_refresh = Timer();
+}
+
+void OSystem_Dreamcast::updateScreen(void)
+{
+  updateScreenTextures();
+  updateScreenPolygons();
+}
+
+void OSystem_Dreamcast::maybeRefreshScreen(void)
+{
+  unsigned int t = Timer();
+  if((int)(t-_last_screen_refresh) > USEC_TO_TIMER(30000))
+    updateScreenPolygons();
 }
 
 void OSystem_Dreamcast::drawMouse(int xdraw, int ydraw, int w, int h,
diff --git a/backends/platform/dc/input.cpp b/backends/platform/dc/input.cpp
index 1b85f601a6..5d4ed7ce96 100644
--- a/backends/platform/dc/input.cpp
+++ b/backends/platform/dc/input.cpp
@@ -202,6 +202,8 @@ bool OSystem_Dreamcast::pollEvent(Common::Event &event)
   if (((int)(t-_devpoll))>=0)
     _devpoll = t + USEC_TO_TIMER(17000);
 
+  maybeRefreshScreen();
+
   int mask = getimask();
   setimask(15);
   checkSound();